Where does “*grunnattjan” come from?

*grunnattjan (Proto-West Germanic) comes from Proto-Germanic grunnatjaną, from Proto-Germanic grunnōną, from Proto-Indo-European gʰrun- — to shout.

Ancestry of “*grunnattjan”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	grunnatjaną	To grunt
2	Proto-Germanic	grunnōną	to grunt
3	Proto-Indo-European	gʰrun-	to shout

*grunnattjan — Etymology, Origin & Word History | Etymology Explorer